|SÎRBU Nicușor Alin||ISIM - UPT Timisoara|
|Spoluautoři ȘERBAN Viorel-Aurel, OANCĂ Octavian, ȘERBAN Șerban-Iancu|
This paper analyzes a particular case of micro-cracking and breaking of a titanium alloy (titanium grade 2) horn used for ultrasonic processing of polymeric materials in the automotive industry. The specialized ultrasonic equipment, working at 20 kHz frequency (20,000 oscillations per second) and with an output power of 2500 Watt was used for joining car armrests. The mechanical stresses to which the titanium alloy horn has been submitted, the usage time and/or its improper exploitation lead, after 6 months, to the emergence of micro-cracks. Their propagation in the maximum amplitude plane of the horn has caused its disuse. The paper presents micro and macro-structural characterization of the material fracture area, design and manufacturing process of the ultrasonic assembly components by using specialized software (C.A.R.D.), material choosing criteria, frequency and amplitude required in order to obtain strong joints and recommendations for increasing lifetime and safe use of the ultrasonic components.